Imaging Apparatus Color-Dependent High Frequency Correction
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Solution Overview
Problem
Conventional imaging apparatuses suffer from deteriorated image quality due to axial chromatic aberration in lens units, leading to false colors and chromatic blur at image edges, which also affect color reproducibility and resolution.
Innovation Solution
An imaging apparatus with color-depending high frequency component changing means that adjusts signal levels of color signals to correct for axial chromatic aberration, using spectral separation and photoelectric conversion, along with focus and zoom control to optimize optical conditions, thereby correcting high frequency components and improving image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If lens units are made compact to reduce imaging apparatus size, then portability and compactness are improved, but optical performance deteriorates due to axial chromatic aberration
Solution Approach 1:
The patent changes the parameter of high frequency component signal levels individually for each color (R, G, B) to correct axial chromatic aberration. By adjusting the gain of high frequency components based on color-specific characteristics, the invention compensates for optical performance deterioration caused by compact lens design, thereby resolving the contradiction between compactness and optical precision.
2Measurement precision
If total pixel numbers are increased to achieve higher resolution, then image resolution is improved, but the impact of axial chromatic aberration on image quality becomes more significant
Solution Approach 1:
The patent applies local quality by individually processing high frequency components for each color channel (R, G, B) rather than applying uniform processing to all pixels. This color-specific local processing corrects axial chromatic aberration effects at different locations in the color signal spectrum, thereby maintaining high resolution while reducing the harmful impact of chromatic aberration on image quality.
3Object-affected harmful factors
If conventional chromatic aberration correction is applied to color difference signals, then chromatic blur is suppressed, but color reproducibility and resolution are deteriorated
Solution Approach 1:
The patent segments the correction process into two distinct parts: (1) suppression of chromatic blur in color difference signals, and (2) correction of high frequency component signal levels for each color. This segmentation allows the invention to address chromatic aberration effects without compromising color reproducibility and resolution, as each segment handles a specific aspect of the correction independently.
4Object-affected harmful factors
If high frequency components are corrected uniformly for all color signals, then chromatic blur is reduced, but color-specific image quality issues persist
Solution Approach 1:
The patent changes parameters (signal levels of high frequency components) individually for each color signal based on its specific characteristics. This color-specific parameter adjustment corrects axial chromatic aberration effects that differ between color channels, thereby achieving precise correction for each color while maintaining overall image quality without the drawbacks of uniform correction.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively suppresses false colors and chromatic blur, maintains high resolution and color reproducibility, and produces a luminance signal with high resolution by correcting waveform responses at image edges influenced by axial chromatic aberration.
Implementation Method 1
color imaging means for separating incident light entered from the lens unit every wavelength of the incident light in a spectral manner
Implementation Method 2
photoelectrically converting the separated incident light into signals
Data Source
AI summary
In the imaging apparatus, an image signal derived from an imaging element is supplied to color signal producing means so as to be separated into a R(red) color signal, a G(green) color signal and a B(blue) color signal. These R, G, B signals are supplied to color-depending frequency component changing means. While predetermined information has been stored in a memory with respect to each of the R signal, the G signal and the B signal, and the predetermined information is used in order to change a signal level of a high frequency component every R, G, B signals, the color-depending frequency component changing means extracts a high frequency component from each of the R signal, the G signal and the B signal, and then, corrects frequency components of these extracted high frequency components in such a manner that the corrected frequency characteristics may constitute relevant signals.